Werevolka
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I think there are many criteria, actually. For example, how about this: if your ears droop, it means the music is bad. If your ears perk up, it means the music is good. ))) But seriously, I'm not even sure if these two concepts (pop and popsa) come from the same root. Any music can be "popsa" (aimed at a mass, not very sophisticated audience). For example, a pop arrangement of classical music is like icing on a bitter pill, so that the masses will swallow it.
